Description
The Garmin GT15M-IH is an in-hull transducer for boats where the installer wants to avoid a transom-mounted sensor and maintain reliable depth readings at speed. It installs inside a compatible fiberglass hull against the bottom.
Main Features
- Mid-band CHIRP traditional sonar
- 85–165 kHz frequency range
- 600 W power rating
- 8-pin Garmin sonar connection
- In-hull installation for compatible fiberglass hulls
Installation
Garmin specifies a supported hull deadrise range of 0–25 degrees. In-hull performance depends on correct tank placement and a suitable solid-fiberglass hull section without core material, voids or trapped air.
Specifications
- Model: GT15M-IH
- Part number: 010-12402-00
- Frequency: Mid-band CHIRP, 85–165 kHz
- Power: 600 W
- Connector: 8-pin
- Mount: In-hull
- Data: Depth

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